branch-4.0: [fix](filecache) avoid SIGSEGV in background LRU update when clear cache #60533#61444
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…che (#60533) The background LRU update thread (BlockFileCache::run_background_block_lru_update) uses cell which is a raw pointer owned by the cache’s internal _files map and may be unset during clearing cache.
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yiguolei
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Mar 18, 2026
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Cherry-picked from #60533